1 /*****************************************************************************
2
3 gif_font.c - utility font handling and simple drawing for the GIF library
4
5 ****************************************************************************/
6
7 #include <string.h>
8
9 #include "gif_lib.h"
10
11 /*****************************************************************************
12 Ascii 8 by 8 regular font - only first 128 characters are supported.
13 *****************************************************************************/
14
15 /*
16 * Each array entry holds the bits for 8 horizontal scan lines, topmost
17 * first. The most significant bit of each constant is the leftmost bit of
18 * the scan line.
19 */
20 /*@+charint@*/
21 const unsigned char GifAsciiTable8x8[][GIF_FONT_WIDTH] = {
22 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* Ascii 0 */
23 {0x3c, 0x42, 0xa5, 0x81, 0xbd, 0x42, 0x3c, 0x00}, /* Ascii 1 */
24 {0x3c, 0x7e, 0xdb, 0xff, 0xc3, 0x7e, 0x3c, 0x00}, /* Ascii 2 */
25 {0x00, 0xee, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00}, /* Ascii 3 */
26 {0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00}, /* Ascii 4 */
27 {0x00, 0x3c, 0x18, 0xff, 0xff, 0x08, 0x18, 0x00}, /* Ascii 5 */
28 {0x10, 0x38, 0x7c, 0xfe, 0xfe, 0x10, 0x38, 0x00}, /* Ascii 6 */
29 {0x00, 0x00, 0x18, 0x3c, 0x18, 0x00, 0x00, 0x00}, /* Ascii 7 */
30 {0xff, 0xff, 0xe7, 0xc3, 0xe7, 0xff, 0xff, 0xff}, /* Ascii 8 */
31 {0x00, 0x3c, 0x42, 0x81, 0x81, 0x42, 0x3c, 0x00}, /* Ascii 9 */
32 {0xff, 0xc3, 0xbd, 0x7e, 0x7e, 0xbd, 0xc3, 0xff}, /* Ascii 10 */
33 {0x1f, 0x07, 0x0d, 0x7c, 0xc6, 0xc6, 0x7c, 0x00}, /* Ascii 11 */
34 {0x00, 0x7e, 0xc3, 0xc3, 0x7e, 0x18, 0x7e, 0x18}, /* Ascii 12 */
35 {0x04, 0x06, 0x07, 0x04, 0x04, 0xfc, 0xf8, 0x00}, /* Ascii 13 */
36 {0x0c, 0x0a, 0x0d, 0x0b, 0xf9, 0xf9, 0x1f, 0x1f}, /* Ascii 14 */
37 {0x00, 0x92, 0x7c, 0x44, 0xc6, 0x7c, 0x92, 0x00}, /* Ascii 15 */
38 {0x00, 0x00, 0x60, 0x78, 0x7e, 0x78, 0x60, 0x00}, /* Ascii 16 */
39 {0x00, 0x00, 0x06, 0x1e, 0x7e, 0x1e, 0x06, 0x00}, /* Ascii 17 */
40 {0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18}, /* Ascii 18 */
41 {0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x00}, /* Ascii 19 */
42 {0xff, 0xb6, 0x76, 0x36, 0x36, 0x36, 0x36, 0x00}, /* Ascii 20 */
43 {0x7e, 0xc1, 0xdc, 0x22, 0x22, 0x1f, 0x83, 0x7e}, /* Ascii 21 */
44 {0x00, 0x00, 0x00, 0x7e, 0x7e, 0x00, 0x00, 0x00}, /* Ascii 22 */
45 {0x18, 0x7e, 0x18, 0x18, 0x7e, 0x18, 0x00, 0xff}, /* Ascii 23 */
46 {0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00}, /* Ascii 24 */
47 {0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18, 0x00}, /* Ascii 25 */
48 {0x00, 0x04, 0x06, 0xff, 0x06, 0x04, 0x00, 0x00}, /* Ascii 26 */
49 {0x00, 0x20, 0x60, 0xff, 0x60, 0x20, 0x00, 0x00}, /* Ascii 27 */
50 {0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xff, 0x00}, /* Ascii 28 */
51 {0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00}, /* Ascii 29 */
52 {0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x00, 0x00}, /* Ascii 30 */
53 {0x00, 0x00, 0x00, 0xfe, 0x7c, 0x38, 0x10, 0x00}, /* Ascii 31 */
54 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* */
55 {0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x30, 0x00}, /* ! */
56 {0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* " */
57 {0x6c, 0x6c, 0xfe, 0x6c, 0xfe, 0x6c, 0x6c, 0x00}, /* # */
58 {0x10, 0x7c, 0xd2, 0x7c, 0x86, 0x7c, 0x10, 0x00}, /* $ */
59 {0xf0, 0x96, 0xfc, 0x18, 0x3e, 0x72, 0xde, 0x00}, /* % */
60 {0x30, 0x48, 0x30, 0x78, 0xce, 0xcc, 0x78, 0x00}, /* & */
61 {0x0c, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ' */
62 {0x10, 0x60, 0xc0, 0xc0, 0xc0, 0x60, 0x10, 0x00}, /* ( */
63 {0x10, 0x0c, 0x06, 0x06, 0x06, 0x0c, 0x10, 0x00}, /* ) */
64 {0x00, 0x54, 0x38, 0xfe, 0x38, 0x54, 0x00, 0x00}, /* * */
65 {0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00}, /* + */
66 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x70}, /* , */
67 {0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00}, /* - */
68 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00}, /* . */
69 {0x02, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x00}, /* / */
70 {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* 0 */
71 {0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x3c, 0x00}, /* 1 */
72 {0x7c, 0xc6, 0x06, 0x0c, 0x30, 0x60, 0xfe, 0x00}, /* 2 */
73 {0x7c, 0xc6, 0x06, 0x3c, 0x06, 0xc6, 0x7c, 0x00}, /* 3 */
74 {0x0e, 0x1e, 0x36, 0x66, 0xfe, 0x06, 0x06, 0x00}, /* 4 */
75 {0xfe, 0xc0, 0xc0, 0xfc, 0x06, 0x06, 0xfc, 0x00}, /* 5 */
76 {0x7c, 0xc6, 0xc0, 0xfc, 0xc6, 0xc6, 0x7c, 0x00}, /* 6 */
77 {0xfe, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x60, 0x00}, /* 7 */
78 {0x7c, 0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0x7c, 0x00}, /* 8 */
79 {0x7c, 0xc6, 0xc6, 0x7e, 0x06, 0xc6, 0x7c, 0x00}, /* 9 */
80 {0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00}, /* : */
81 {0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x20, 0x00}, /* }, */
82 {0x00, 0x1c, 0x30, 0x60, 0x30, 0x1c, 0x00, 0x00}, /* < */
83 {0x00, 0x00, 0x7e, 0x00, 0x7e, 0x00, 0x00, 0x00}, /* = */
84 {0x00, 0x70, 0x18, 0x0c, 0x18, 0x70, 0x00, 0x00}, /* > */
85 {0x7c, 0xc6, 0x0c, 0x18, 0x30, 0x00, 0x30, 0x00}, /* ? */
86 {0x7c, 0x82, 0x9a, 0xaa, 0xaa, 0x9e, 0x7c, 0x00}, /* @ */
87 {0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0x00}, /* A */
88 {0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xfc, 0x00}, /* B */
89 {0x7c, 0xc6, 0xc6, 0xc0, 0xc0, 0xc6, 0x7c, 0x00}, /* C */
90 {0xf8, 0xcc, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0x00}, /* D */
91 {0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xfe, 0x00}, /* E */
92 {0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0x00}, /* F */
93 {0x7c, 0xc6, 0xc0, 0xce, 0xc6, 0xc6, 0x7e, 0x00}, /* G */
94 {0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0x00}, /* H */
95 {0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00}, /* I */
96 {0x1e, 0x06, 0x06, 0x06, 0xc6, 0xc6, 0x7c, 0x00}, /* J */
97 {0xc6, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0xc6, 0x00}, /* K */
98 {0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0x00}, /* L */
99 {0xc6, 0xee, 0xfe, 0xd6, 0xc6, 0xc6, 0xc6, 0x00}, /* M */
100 {0xc6, 0xe6, 0xf6, 0xde, 0xce, 0xc6, 0xc6, 0x00}, /* N */
101 {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* O */
102 {0xfc, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0x00}, /* P */
103 {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x06}, /* Q */
104 {0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0x00}, /* R */
105 {0x78, 0xcc, 0x60, 0x30, 0x18, 0xcc, 0x78, 0x00}, /* S */
106 {0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00}, /* T */
107 {0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* U */
108 {0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00}, /* V */
109 {0xc6, 0xc6, 0xc6, 0xd6, 0xfe, 0xee, 0xc6, 0x00}, /* W */
110 {0xc6, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0xc6, 0x00}, /* X */
111 {0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18, 0x18, 0x00}, /* Y */
112 {0xfe, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xfe, 0x00}, /* Z */
113 {0x3c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3c, 0x00}, /* [ */
114 {0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x03, 0x00}, /* \ */
115 {0x3c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c, 0x00}, /* ] */
116 {0x00, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00}, /* ^ */
117 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff}, /* _ */
118 {0x30, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ` */
119 {0x00, 0x00, 0x7c, 0x06, 0x7e, 0xc6, 0x7e, 0x00}, /* a */
120 {0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0x00}, /* b */
121 {0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0x7e, 0x00}, /* c */
122 {0x06, 0x06, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x00}, /* d */
123 {0x00, 0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0x7e, 0x00}, /* e */
124 {0x1e, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x30, 0x00}, /* f */
125 {0x00, 0x00, 0x7e, 0xc6, 0xce, 0x76, 0x06, 0x7c}, /* g */
126 {0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00}, /* */
127 {0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x3c, 0x00}, /* i */
128 {0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0xf0}, /* j */
129 {0xc0, 0xc0, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0x00}, /* k */
130 {0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00}, /* l */
131 {0x00, 0x00, 0xcc, 0xfe, 0xd6, 0xc6, 0xc6, 0x00}, /* m */
132 {0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00}, /* n */
133 {0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* o */
134 {0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0xc0}, /* p */
135 {0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x06}, /* q */
136 {0x00, 0x00, 0x6e, 0x70, 0x60, 0x60, 0x60, 0x00}, /* r */
137 {0x00, 0x00, 0x7c, 0xc0, 0x7c, 0x06, 0xfc, 0x00}, /* s */
138 {0x30, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x1c, 0x00}, /* t */
139 {0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00}, /* u */
140 {0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00}, /* v */
141 {0x00, 0x00, 0xc6, 0xc6, 0xd6, 0xfe, 0x6c, 0x00}, /* w */
142 {0x00, 0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00}, /* x */
143 {0x00, 0x00, 0xc6, 0xc6, 0xce, 0x76, 0x06, 0x7c}, /* y */
144 {0x00, 0x00, 0xfc, 0x18, 0x30, 0x60, 0xfc, 0x00}, /* z */
145 {0x0e, 0x18, 0x18, 0x70, 0x18, 0x18, 0x0e, 0x00}, /* { */
146 {0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00}, /* | */
147 {0xe0, 0x30, 0x30, 0x1c, 0x30, 0x30, 0xe0, 0x00}, /* } */
148 {0x00, 0x00, 0x70, 0x9a, 0x0e, 0x00, 0x00, 0x00}, /* ~ */
149 {0x00, 0x00, 0x18, 0x3c, 0x66, 0xff, 0x00, 0x00} /* Ascii 127 */
150 };
151 /*@=charint@*/
152
153 void
GifDrawText8x8(SavedImage * Image,const int x,const int y,const char * legend,const int color)154 GifDrawText8x8(SavedImage *Image,
155 const int x, const int y,
156 const char *legend,
157 const int color)
158 {
159 int i, j;
160 int base;
161 const char *cp;
162
163 for (i = 0; i < GIF_FONT_HEIGHT; i++) {
164 base = Image->ImageDesc.Width * (y + i) + x;
165
166 for (cp = legend; *cp; cp++)
167 for (j = 0; j < GIF_FONT_WIDTH; j++) {
168 if (GifAsciiTable8x8[(short)(*cp)][i] & (1 << (GIF_FONT_WIDTH - j)))
169 Image->RasterBits[base] = color;
170 base++;
171 }
172 }
173 }
174
175 void
GifDrawBox(SavedImage * Image,const int x,const int y,const int w,const int d,const int color)176 GifDrawBox(SavedImage *Image,
177 const int x, const int y,
178 const int w, const int d,
179 const int color)
180 {
181 int j, base = Image->ImageDesc.Width * y + x;
182
183 for (j = 0; j < w; j++)
184 Image->RasterBits[base + j] =
185 Image->RasterBits[base + (d * Image->ImageDesc.Width) + j] = color;
186
187 for (j = 0; j < d; j++)
188 Image->RasterBits[base + j * Image->ImageDesc.Width] =
189 Image->RasterBits[base + j * Image->ImageDesc.Width + w] = color;
190 }
191
192 void
GifDrawRectangle(SavedImage * Image,const int x,const int y,const int w,const int d,const int color)193 GifDrawRectangle(SavedImage *Image,
194 const int x, const int y,
195 const int w, const int d,
196 const int color)
197 {
198 unsigned char *bp = Image->RasterBits + Image->ImageDesc.Width * y + x;
199 int i;
200
201 for (i = 0; i < d; i++)
202 memset(bp + (i * Image->ImageDesc.Width), color, (size_t)w);
203 }
204
205 void
GifDrawBoxedText8x8(SavedImage * Image,const int x,const int y,const char * legend,const int border,const int bg,const int fg)206 GifDrawBoxedText8x8(SavedImage *Image,
207 const int x, const int y,
208 const char *legend,
209 const int border,
210 const int bg, const int fg)
211 {
212 int i, j = 0, LineCount = 0, TextWidth = 0;
213 const char *cp;
214
215 /* compute size of text to box */
216 for (cp = legend; *cp; cp++)
217 if (*cp == '\r') {
218 if (j > TextWidth)
219 TextWidth = j;
220 j = 0;
221 LineCount++;
222 } else if (*cp != '\t')
223 ++j;
224 LineCount++; /* count last line */
225 if (j > TextWidth) /* last line might be longer than any previous */
226 TextWidth = j;
227
228 /* fill the box */
229 GifDrawRectangle(Image, x + 1, y + 1,
230 border + TextWidth * GIF_FONT_WIDTH + border - 1,
231 border + LineCount * GIF_FONT_HEIGHT + border - 1, bg);
232
233 /* draw the text */
234 i = 0;
235 cp = strtok((char *)legend, "\r\n");
236 do {
237 int leadspace = 0;
238
239 if (cp[0] == '\t')
240 leadspace = (TextWidth - strlen(++cp)) / 2;
241
242 GifDrawText8x8(Image, x + border + (leadspace * GIF_FONT_WIDTH),
243 y + border + (GIF_FONT_HEIGHT * i++), cp, fg);
244 cp = strtok((char *)NULL, "\r\n");
245 } while (cp);
246
247 /* outline the box */
248 GifDrawBox(Image, x, y, border + TextWidth * GIF_FONT_WIDTH + border,
249 border + LineCount * GIF_FONT_HEIGHT + border, fg);
250 }
251
252 /* end */
253